refractor: add initial go internall pkg module.

pkg/util/tools.go

@@ -0,0 +1,40 @@
+// apparmor.d - Full set of apparmor profiles
+// Copyright (C) 2023 Alexandre Pujol <alexandre@pujol.io>
+// SPDX-License-Identifier: GPL-2.0-only
+
+package util
+
+import (
+	"encoding/hex"
+	"os"
+	"os/exec"
+	"regexp"
+	"sort"
+	"strings"
+)
+
+var isHexa = regexp.MustCompile("^[0-9A-Fa-f]+$")
+
+// DecodeHex decode a string if it is hexa.
+func DecodeHex(str string) string {
+	if isHexa.MatchString(str) {
+		bs, _ := hex.DecodeString(str)
+		return string(bs)
+	}
+	return str
+}
+
+// RemoveDuplicate filter out all duplicates from a slice. Also filter out empty string
+func RemoveDuplicate[T comparable](inlist []T) []T {
+	var empty T
+	list := []T{}
+	keys := map[T]bool{}
+	keys[empty] = true
+	for _, item := range inlist {
+		if _, ok := keys[item]; !ok {
+			keys[item] = true
+			list = append(list, item)
+		}
+	}
+	return list
+}